SAN FRANCISCO (Reuters) - Uber Technologies Inc's former chief executive and some board members knew of a letter a U.S. judge has said was withheld from a high-stakes lawsuit, an attorney for the company testified on Wednesday.

SAN FRANCISCO (Reuters) - Uber Technologies Inc's former chief executive and some board members knew of a letter a U.S. judge has said was withheld from a high-stakes lawsuit, an attorney for the company testified on Wednesday.